Bottle base



FIG. 1 is a perspective view of the bottle base of the presentinvention;

FIG. 2 is a side view of the bottle base of FIG. 1;

FIG. 3 is a bottom view of the bottle base of FIG. 1; and,

FIG. 4 is a top view of the bottle base of FIG. 1.

The broken line showing in FIGS. 1 & 2 is for illustrative purposes onlyand forms no part of the claimed design.

The ornamental design for a bottle base, as shown and described.